The Oxford English Dictionary used 1,827,306 quotations to help define its 414,825 words. Tens of thousands of those used in the first edition came from the erudite, moneyed American Civil War veteran Dr. W.C. Minor--all from a cell at the Broadmoor Criminal Lunatic Asylum. Vanity Fair contributor Winchester (River at the Center of the World) has told his story in an imaginative if somewhat superficial work of historical journalism. Sketching Minor's childhood as a missionary's son and his travails as a young field surgeon, Winchester speculates on what may have triggered the prodigious paranoia that led Minor to seek respite in England in 1871 and, once there, to kill an innocent man. Pronounced insane and confined at Broadmoor with his collection of rare books, Minor happened upon a call for OED volunteers in the early 1880s. Here on more solid ground, Winchester enthusiastically chronicles Minor's subsequent correspondence with editor Dr. J.A.H. Murray, who, as Winchester shows, understood that Minor's endless scavenging for the first or best uses of words became his saving raison d'etre, and looked out for the increasingly frail man's well-being. Winchester fills out the story with a well-researched mini-history of the OED, a wonderful demonstration of the lexicography of the word ""art"" and a sympathetic account of Victorian attitudes toward insanity. With his cheeky way with a tale (""It is a brave and foolhardy and desperate man who will perform an autopeotomy"" he writes of Minor's self-mutilation), Winchester celebrates a gloomy life brightened by devotion to a quietly noble, nearly anonymous task. Photos not seen by PW. Agent, Peter Matson. BOMC selection. (Sept.)